Die casting and method of welding same to a metallic surface



April 29, 1924. 1,491,879

c. PACK ET AL DIE CASTING AND METHOD CF WELDING SAME TO A METALLIC SURFACE Filed March 22. 1921 gvwawtow' QM l 85 mb mgr W Patented Apr. 29, I924.

CHARLES PACK, ELMHURST, AND STANLEY B. KUECH, OF BROOKLYN, NEW YORK, ASSIGNORS TO DOEHLER DIE CASTING COMPANY, OF BROOKLYN, NEW YORK, A

CORPORATION OF NEW YORK.

DIE CASTING AND METHOD OF WELDING S AME TO A METALLIC SURFACE.

Application 111 a March 22, 1921. Serial No. 454,361.

' To all whom c't may concern:

' Be it known that-we, CHARLES PACK and STANLEY R. KUECH, both citizens of the United States, residing, respectively, at

Elmhur'st, in the county of Queens, city and State of New York, and in the borough of Brooklyn, county of Kings, city and State of New York, have invented certam new and useful Im rovements in Die Castings 10 and Methods 0 Weldin Same to a Metallic Surface, of which the ollowing is a specification.

The object of this invention is to provide a simple, inexpensive and effective method of and means for welding to metalllc surfaces generally die-castings of the class commonly termed White;metal and composed chiefly of aluminum alloyed w1th various other metals such as zinc, tin, nlckel;

etc. .1 The problem involved hinges chiefly upon the character of the material of which .such'castings are composed. In the production of die-castings, the moltelrmetal is forced, either by gravity or air-pressure, into a steeldie from which, after solidification and substantial loss ofcontamed heat, itis removed. In this process of solidlfication, the action takes place first at the exterior of the casting, proceedmg thence to the interior. There is thus set up a tendency of the metal to shrink and raw and this commonly results in the formation of air-holes. It has been found that such airholes form mainly in the interior of the casting, the exterior being practlcally free therefrom, the solld ortlon' extend ng an appreciable distance 1nto the casting depending, among other things, upon. .its design and mass. 0 1

In the welding of such a casting to a metallic surface, as by the autogenous process, the heat promptly fuses and breaks through the solid outer portlon of the casting, exposing the inner more-or-less cellular or spongy portion and, wh le the weld ma be mechanically strong, 1t is necessarily unsightly, the exposed surface of the casting at the welded po nt belng pitted and without finish.

Under the present inventlon, we take ad vantage of the fact above noted, that -to an appreciable extent'the exterlor and lmmediat'ely adjacent portions of a die-casting 'are substantially free. from; air-holes. We,

therefore, preferably during the process of being free from objectionable air-holes which would be exposed by the welding operation. By the application of the torch to such flange and either by partially (or wholly) fusing the same or bythe addition of molten metal thereto during the welding operation, the casting may readily be welded to a metallic surface by a smooth and finished weld and without sacrifice of the required strength of the union.

Referring to the accompanying drawing, we have illustrated for thepurpose of this disclosure a white-metal die-casting forming part of the handle of a culinary utensil. In this-drawing, Fig.1 is an'ele Vation, partly in section of such handle-part and a portion of the utensil, and Figs. 2 and 3 are respectively an elevation and a sectional view taken on the line 3-3 of Fig. 2, illustrating the practice of this invention.

The handle-part 1, by reason of its, formation in a steel die as aforesaid, is'characterized by a hard, smooth and substantially solid exterior portion 2 extending an I This would be apt to occur even if the effort were to effect the weld by means of added.

metal owing to the heat of the torch adjacent to the point of union.

Under our invention we'provide what we point of union, making this, preferably, integral with'the casting, of the maximum thickness that can be relled upon to solidify during the cooling of such ;casting. A

term asvwelding flange 7 adjacent to the i an inch will be found practicable with the a majority of small casti n s. Y It Wlll be a parent 5m, the metal of such welding ange being solid and substantially free from air-holes, it may readily be joined to the metallic part 5 by autogenous welding as at 8, involving either the addition of metal or the fusing of the metal of such flange (or both) without leaving a rou h or itted surface but, on the contrary, t e wel ing line being smooth and practically finished upon the removal of the torch. v

What we claim is The method of'uniting a white metal die-casting with a metallic surface, such' metal and welding such part to said metal- 'lic surface, substantially as set forth.

This specification signed and witnessed this 18th day of March, 1921. a

v CHAS. PACK.

. STANLEY R. KUECH. Witnesses:

WILLIAM R. AHRBERG, WILL Am E. BaUn scH Im'r. 

